Signaling device for telephone systems.



A. J. DUNTON. VICE PoR TELEPHONE SYSTEMS.

l *n SIGNALINGDE l Patented June 20, 1911.4

APPLICATION FILED JULY 7I 1910.

' numlwl' l' Arron/vers A. J. DUNTON. SIGNALING DEVICE FOR TELEPHONE SYSTEMS. APPLIOATION FILED JULY 7, 1910.

3 SHEETS-SHEET 2.

,K 49 v- Patented June 20, 1911.

A. J. DUNTON. lSIGNALING DEVICE FOR TELEPHONE SYSTEMS.

APPLICATION FILED JULY 7, 1910.

Patented June 20, 1911.

3 SHBETS-SHEBT 3.

Vga/7 A Arm/mers senses. y

1 @Till i AT' SIGNAL'LNG DEVICE FOR TELEPHONE SYSTEMS.

Specication of Letters Patent.

)Patented June 20, 1911.

Application filed July 7, 1910. Serial No. 570,787.

To all whom it may concern: v

Be it known that 1, Aunis J". DUNTON, a citizen of the United States, and a resident of Ketchikan, in Athe District of Alaska, have made certain new and useful Improvements in Signaling Devices for Telephone Systems, of which the following is a speciiication.

My invention relates to improvements in means for signaling, without the use of the ordinary signaling bells, and it consists in the combinations, construction and arrangement ot the parts herein described and claimed.

The invention is somewhat similar in its.

nature tol that disclosedvin the patent to George H. Caughrean No. 978,695, December 13, 1910, but differs in certain novel features, which will be hereinafter described, and which will be particularly pointed outl in the appended claims.

The main object of my invention is to provide a signaling system in which the signals may be sent to a considerable distance, as far as the line is likely to be used for talking purposes. y p

A further object of my invention is to provide a signaling system with simple apparatus, including a relay for producing audible signals.

A. further object of my invention lis to provide a signaling device in which the signals may be varied in intensity or pitch as desired, so that it a telephone is placed upon the desk of the user, the intensity of sound from the signal may be decreased, so as not to cause annoyance to others in the room, or if theY telephone is put in an adjoining room, it may be made to send out a loud signal, so as to insure its being heard.

Other objects andadvantages will appear in `the following specification. y

Myginvention is illustrated in the accompanying drawings, forming part of this application, in` which similar reference characters. denote like parts in the several views and in which` Figure 1 is a ,side view partly in section, showing the relation between the 'transmit- Fig. 5 is a diagrammatic View showing the circuit connections for two stations.

In carrying out my invention, l provide a telephone set of the Aform shown in Figs. 1, 2 and 3, this form being best adapted for use in my improved signaling system.

As will be seenL from Fig. 1,l the set comprises a base 1 of insulating material, which is provided with a `shoulder 1a, to receive a casing 2, the latter being preferably of metal, and being provided with the flanges 3, by means of whlch the device may be suspended from the wall or any other convenient place. 0n the exterior portion of the base 1, 1 arrange a holder 4 for a transmitter, the mouth piece 5 of which is shown in the iigure. This transmitter may be of any approved type, the specific form of which forms no part ot my invention.

Secured to the base 1 on the inside of the casing 2 is an induction coil 6. A relay Z (see Fig. 3) is also secured to the base and is provided with an armature 8, which is held by a spring 9 in a normally retracted position. In this position it engages a contact screw 10, which is carried by an arm 11.

The contact screw 10, however, is insulated from the arm as is shown in the drawings.

.Secured to the base 1 is a series of spring vcontacts a, b, @,d, and e, respectively, these contacts being suitably insulated from each other by insulation such as that shown at 12. @ne of these insulating portions 13 ei:- tends upwardly between the arms c and This portion of the insulation is flexible and bends with the springs, so as to follow their movement. As will be seen fromgthe drawings, the spring l) is prolonged, and is engaged by the short arm 14a of a hook switch 14. The latter projects through an opening 15 in the base 1 and is pivotally mounted at 16. The arm 14a has an insulated roller 17 adapted t-o engage the spring b to move the latter. As will be seen from' Fig. 3, the arm 14 is suitably insulated so that the spring b will not engage it electrically.

i The construction of the switch hook is clearly shown in Figs. 1 and 4. -It consists of a hook 14b secured to a hollow sleeve 14c into .which the arm 14dof the bell-crank lever projects. The sleeve 14c is provided with a set screw 14, so that the hook may be extended to bring the receiver further away from, or nearer to the transmitter.

The receiver 18 is of the ordinary watch 4case type and is provided with a holding A desires to call the party at station C. He.

simply removes the receiver 18a from the switch hook.l Current will now flow from the battery BEL by the following path: 21, transmitter T, 22, primary of induction coil, 23, b, a (the springb having moved toward a when the receiver was removed) 24, e, line Wire 25, 26, relay 7b, 27, spring db, spring eb, line wire 28, 29, screw 10, armature 8, and

back to battery B by means of the ,con-,

ductor 30. It will be notioed'that this circuit just traced does not cause a movement of the relay 7a. The circuit just traced causes the relay 7" to pull up its armature, thereupon the following circuit: is established: From battery B", through 31., transmitter T", 32, primary coil of thel inductioncoil at station C, 33, spring bb, spring c", 34, through the frame of the relay 7", contact p "screw armature 8"` and by conductor 36 to thebattery. The receiver 18b is in a shunt circuit, which includes a secondary coil at the station C, the conductor 37, the receiver 18b and the conductor 38, which joins the conductor 33. When the receiver is held before'the transmitter t'. e., when these instruments are in their mutual fields, the variation of the current will cause a-sound which varies from a low buzzin noise to a shrill ,whistle or howl, and this will continue as long as the receiver at station A is held olf from the hook. As has been stated before, the distance of the receiver from the transmitter may be varied so that this sound may be increased or diminished, or made high or low, as described. There will be no sound at the sending station, since,` as stated before, the relay 7*? does not pull up.

When the called subscriber answers he removes his receiver from the hook. The talking circuit' is -then established between vthe t-wo stations as follows: From Ba, through 21, Ta, 22, primary coil of station A, 23, b, a, 24., 25, 39, 10b, 8b, a6, battery Bb, a1, Tb, 3a, primary coil of station C, 33, bb, ab, 40, e, line wire 28, 29, 10, 8, 30 and back to battery B. It will thus be seen that when the p talking circuit is established, the relays are cut out. There will, therefore, be no whistling sound as long as the receivers are held off from the hooks. When one receiver is replaced, the' whistling sound of t-he other station will begin, thus notifying the other stationthat one subscriber has quit talking. lVhen bothsubscribers hang up their receivers, the line is restored toits normal condition. It will be observed that when both relays denergized battery current` is cut olf entirely, and, hence, there is 4 no waste of current. Y

This system does away entirely with the use of bells or other signaling apparatus and worlrswell over long distances, since it is apparent that itwill workl over any distance or upon anyy circuit which will cause the actuation of the relay to'throw in the local circuit through the transmitter at any particular stat-ion. v

I claim: f

1. In a telephone signaling system, a plurality of substations, line wires connecting said substations, a transmitter and a receiver at each substation, said transmitter and receiver being normallyv placed in proximity in their mutual fields, and means actuated by the removal ofthe receiverat one of the substations for causing a whistling sound at the second substation, said means including the transmitter and the receiver at the second substation.

21"ln a telephone signaling system, substations, a pair of line wires connecting said substations, a` relay at each substation, a transmitter and a receiver at each substation normally placed in roximity in their mut-ual fields, the transmitters of eachsubstation being in a local circuit controlled byits relay, and a switch at each substation for controlling the relay at the otherk substation. n

3. Ina telephone signaling system, a plurality of substations, line wires vconnecting said substations, a transmitter and a receiver at each substation, said transmitter and :re-- ceiver being normally placed in close proximity in' their mutual fields, and means including a relay at each station and the transmitter and receiver of the same station for causing an audible signal at that station when the receiver of the other station is remved'from its hook.

4. In a telephone signaling system, 'a pair 115 of substations,. a pair of line wires connecting said substations, a transmitter and a receiver at each substation, said transmitter and receiver being normally placed in close proximity in their mutual elds, means including a relay at each station and the transmitter and receiver of the same station`for causing an audible signal at that station when the receiver of the,` other statlon is removed from its hook, and means Afor varying the intensity of the signal.

r 5. In a telephone signalingsystem, a pair of stations, each station including a local battery, a transmitter in circuit with saidv battery, a receiver normally in close proximity to said transmitter, a switch hook for suspending said receiver, a switch adapted to be actuated by the removal of said re-` ceiver, an induction coil, and circuit con nections between said stations, the removal of the receiver at lone station causing the actuation of the relay at the other station for closing the circuit through the transmitter at the second station, and thereby causing an audible signal.` i

(3. In a telephone, system, a pair of stations, a receiver anda transmitter atv each station, said receiver and transmitter being normally placed in' close proximity in their mutual fields, a battery at each station, means for causing a flow of current through the transmitter of one station when the receiver of the other station is lifted from .its hook,`and means for completing a talking circuit between the two stations when both receivers are liftedv from theirhooks, said means including the receivers and transmit-- ters of each of said stat-ions.

7. In a telephone system, a pair of stations, a receiver and a transmitter at each station, said receiver and transmitter being normally in their mutual fields, a battery at each station, means for causing a flow of current through the transmitter of one station when the receiver of the other station is lifted from its hook, and means for completing a talking circuitbetween the two stations when both receivers 'are lifted from their hooks. v 8. In a telephone signaling system, a telephone set comprising a casing, a transmitter carried thereby, a switch in said casing, a receiver, an adjustable switch hook for suspending said receiver at varying distances from said transmitter, and means carried by said switch hook for maintaining the rey ceiver in position.

positions parallel to its-original 9. In a telephone signaling system, a telei phone set comprising a casing, a transmitter carried thereby, a switch and a relay in said casing, a receiver, and a switch hook for actuating said switch and Jfor suspending said receiver in front of said transmitter, 

